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This directory contains all of the code for running Sapphire as a Java library with your Android apps. We also include our example applications, performance testing applications and scripts for deploying applications across servers.

  • deployment: scripts for running Sapphire applications on servers. Starts the Sapphire servers for the "cloud side" and the OMS (called the OTS in the paper).

  • example_apps: our todo list application and twitter-like application.

  • generators: scripts for running our compiler for generating Sapphire object stubs and DM stubs.

  • sapphire: the core Sapphire library. Contains the following packages (located in app/src/main/java/sapphire):

    • app: Application specific classes, like the starting point for bootstrapping a Sapphire app.
    • common: Basic data structures.
    • compiler: our compiler for generating Sapphire object and DM component stubs.
    • dms: some example deployment managers
    • kernel: the Sapphire kernel server that runs as a library on every node that runs a Sapphire app.
    • oms: the Object Management/Tracking Service. (called the OTS in the paper).
    • runtime: library functions for creating a Sapphire object (hack because we don't have sapphire keywords in the JVM).
  • tests: performance testing apps. Good example simple example application with one Sapphire object.

Building Sapphire for x86

The core Sapphire library and example apps can be compiled as x86 Java apps using Maven. The dependencies for building Sapphire for x86 are Java, Python, and Maven (apt install openjdk-8-jdk python maven on Ubuntu).

  1. Compile the core Sapphire library:

     $ cd sapphire
     $ mvn package
  2. Generate the stubs for the core Sapphire library:

     $ cd ../generators
     $ python
  3. Compile the core Sapphire library again so that it includes the stubs:

     $ cd ../sapphire
     $ mvn package
  4. Compile an example app:

     $ cd ../example_apps/HanksTodo
     $ mvn package
  5. Generate the stubs for the example app:

     $ cd ../../generators
     $ python
  6. Compile the example app again so that it includes the stubs:

     $ cd ../example_apps/HanksTodo
     $ mvn package

Running Sapphire on x86

  1. Place your servers in deployment/servers.json.

  2. Place the config for the app that you want to run in deployment/ This file needs a starting point for the server-side and the client-side of your Sapphire app.

  3. Run to run the app. Make sure the variable log_folder at the top of is set to a valid path.

Building and running Sapphire on Android

The Sapphire core library and example app directories are Android Studio projects, so these components can each be built using the Android Studio IDE or command-line tools. Before building Sapphire components for Android, make sure to compile the components for x86 and generate stub files as described above. Also, the example apps contain dependencies on the AAR file generated by building the core Sapphire library, so build the core library before building example apps.

Third-party licenses

The subdirectories java, javax, and org of sapphire/app/src/main/java/ contain source code from the Apache Harmony project (with slight modifications to some files). These source files are distributed under the Apache License. The full license is in the file LICENSE-apache-harmony.


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